fix: preserve prompt quoting in gemini CLI invocation

The GEMINI_ARGS variable caused word-splitting on the multi-line PROMPT
string, breaking the gemini CLI argument parsing. Use a separate
DEBUG_FLAG variable instead and keep "${PROMPT}" quoted in each
invocation.

Ref: #479

Author: michalszelagsonos

action.yml

@@ -311,30 +311,30 @@ runs:
         # Keep track of whether we've failed
         FAILED=false
 
-        # Build the base command arguments
-        GEMINI_ARGS="--yolo --prompt ${PROMPT} --output-format json"
+        # Determine debug flag
+        DEBUG_FLAG=""
         if [[ "${GEMINI_DEBUG}" = true ]]; then
-          GEMINI_ARGS="--debug ${GEMINI_ARGS}"
+          DEBUG_FLAG="--debug"
         fi
 
         # Run Gemini CLI with the provided prompt, using JSON output format
         # We capture stdout (JSON) to TEMP_STDOUT and stderr to TEMP_STDERR
         if [[ "${OUTPUT_TO_FILE}" = true ]]; then
           echo "::notice::Gemini CLI output redirected to files (gemini-artifacts/)"
-          if ! gemini ${GEMINI_ARGS} 2> "${TEMP_STDERR}" 1> "${TEMP_STDOUT}"; then
+          if ! gemini ${DEBUG_FLAG} --yolo --prompt "${PROMPT}" --output-format json 2> "${TEMP_STDERR}" 1> "${TEMP_STDOUT}"; then
             FAILED=true
           fi
         elif [[ "${GEMINI_DEBUG}" = true ]]; then
           echo "::warning::Gemini CLI debug logging is enabled. This will stream responses, which could reveal sensitive information if processed with untrusted inputs."
           echo "::: Start Gemini CLI STDOUT :::"
-          if ! gemini ${GEMINI_ARGS} 2> >(tee "${TEMP_STDERR}" >&2) | tee "${TEMP_STDOUT}"; then
+          if ! gemini ${DEBUG_FLAG} --yolo --prompt "${PROMPT}" --output-format json 2> >(tee "${TEMP_STDERR}" >&2) | tee "${TEMP_STDOUT}"; then
             FAILED=true
           fi
           # Wait for async stderr logging to complete. This is because process substitution in Bash is async so let tee finish writing to ${TEMP_STDERR}
           sleep 1
           echo "::: End Gemini CLI STDOUT :::"
         else
-          if ! gemini ${GEMINI_ARGS} 2> "${TEMP_STDERR}" 1> "${TEMP_STDOUT}"; then
+          if ! gemini --yolo --prompt "${PROMPT}" --output-format json 2> "${TEMP_STDERR}" 1> "${TEMP_STDOUT}"; then
             FAILED=true
           fi
         fi